地すべりの地形, 地質および変質特性

DOI Web Site 被引用文献7件 参考文献33件

書誌事項

タイトル別名
  • Characteristics of, Topography, Geology and Alteration in Slide Areas
  • ヂスベリ ノ チケイ チシツ オヨビ ヘンシツ トクセイ ホッカイドウ モンベツグン イクタハラチョウ トウブ チイキ ノ レイ
  • An Example from the Eastern Region of the Ikutahara District in Northeastern Hokkaido, Japan
  • 北海道紋別郡生田原町東部地域の例

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抄録

Characteristics of twenty-nine ancient slides which were surveyed in the eastern region of the Ikutahara district in northeastern Hokkaido, Japan are as follows;<BR>The scale of the slides is about 120-1, 170 m wide and 190-1, 280 m long. Most of the slides can be classified as “Concave Hill Type”, “Slides Occurring in Hydrothermal Alteration Zones” and “Detritus and Clayey Soil Slides” based on their geomorphological features, bedrock geology and displaced materials, respectively.<BR>It is believed that the “Slides Occurring in Hydrothermal Alteration Zones” situated on volcaniclastic rocks of the Upper Miocene Ikutahara Formation, moved due to a stage I vein-related interstratified sericite/smectite zone and a stage II vein-related argillized kaolin mineral zone in hydrothermal alteration haloes and a homoclinal structure, while those of the Upper Miocene Yahagi Formation moved due to a stage I regional smectite zone. The slides located on mudstones of the Ikutahara Formation are believed to have occurred due to complex folding structures and distribution of the mudstones which make up the interstratified sericite/smectite zone. “Slides Occurring in Hydrothermal Alteration Zones” are closely related in space to interstratified sericite/smectite, smectite, and argillized kaolin mineral zones.<BR>“Slides Occurring in Crushed Zones” situated on rocks of the Upper Cretaceous -Paleocene Yubetsu Group, are thought to have occurred due to a fault, a homoclinal structure, and distribution of shales.<BR>“Granitic Rocks -Type Slides” probably occurred due to weathering along fault and joint planes in the hydrothermally altered or the least altered nevaditic biotite rhyolite intrusives.

収録刊行物

  • 地すべり

    地すべり 33 (1), 1-8_1, 1996

    公益社団法人 日本地すべり学会

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